/* ===== CSS Variables ===== */
:root {
    --primary: #4F46E5;
    --primary-dark: #3730A3;
    --primary-light: #EEF2FF;
    --secondary: #10B981;
    --secondary-light: #D1FAE5;
    --dark: #1F2937;
    --gray-700: #374151;
    --gray-600: #4B5563;
    --gray-500: #6B7280;
    --gray-400: #9CA3AF;
    --gray-300: #D1D5DB;
    --gray-200: #E5E7EB;
    --gray-100: #F3F4F6;
    --light: #F9FAFB;
    --white: #FFFFFF;
    --danger: #EF4444;
    --warning: #F59E0B;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--dark);
    background-color: var(--white);
    line-height: 1.6;
    font-size: 16px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ===== Layout ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 0.75rem;
}

.section-header p {
    font-size: 1.15rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.95rem;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-lg {
    padding: 0.9rem 2rem;
    font-size: 1.05rem;
}

.btn-block {
    width: 100%;
}

/* ===== Navbar ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    padding: 0.8rem 0;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.logo-icon {
    color: var(--primary);
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--gray-600);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.lang-btn {
    background: transparent;
    border: 1.5px solid var(--gray-300);
    border-radius: var(--radius);
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: all 0.2s;
}

.lang-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.user-greeting {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    padding: 0 0.25rem;
}

.nav-cta {
    padding: 0.5rem 1.2rem;
    font-size: 0.9rem;
}

/* ===== Hero Section ===== */
.hero {
    padding: 5rem 0 4rem;
    background: linear-gradient(180deg, var(--primary-light) 0%, var(--white) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--dark);
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, #7C3AED 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.hero-trust {
    display: flex;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--gray-500);
}

/* Dashboard Preview */
.dashboard-preview {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.preview-header {
    background: var(--gray-100);
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot.red { background: #EF4444; }
.dot.yellow { background: #F59E0B; }
.dot.green { background: #10B981; }

.preview-title {
    margin-left: 0.5rem;
    font-size: 0.8rem;
    color: var(--gray-500);
}

.preview-body {
    display: grid;
    grid-template-columns: 180px 1fr;
    min-height: 250px;
}

.preview-sidebar {
    background: var(--gray-100);
    padding: 1rem;
    border-right: 1px solid var(--gray-200);
}

.sidebar-item {
    padding: 0.6rem 0.8rem;
    border-radius: 6px;
    font-size: 0.82rem;
    color: var(--gray-600);
    margin-bottom: 0.3rem;
    cursor: default;
}

.sidebar-item.active {
    background: var(--primary);
    color: var(--white);
}

.preview-main {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-card {
    text-align: center;
    color: var(--gray-500);
    font-size: 0.9rem;
}

.typing-indicator {
    display: flex;
    gap: 4px;
    justify-content: center;
    margin-bottom: 0.75rem;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 60%, 100% { opacity: 0.3; transform: scale(0.8); }
    30% { opacity: 1; transform: scale(1); }
}

/* ===== Features Section ===== */
.features {
    padding: 5rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.feature-card p {
    font-size: 0.92rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== How It Works ===== */
.how-it-works {
    padding: 5rem 0;
    background: var(--white);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.step-card {
    text-align: center;
    padding: 2rem 1.5rem;
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 800;
    margin: 0 auto 1.25rem;
}

.step-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--dark);
}

.step-card p {
    font-size: 0.92rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== Social Proof ===== */
.social-proof {
    padding: 4rem 0;
    background: var(--gray-100);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--gray-600);
}

/* ===== CTA Section ===== */
.cta-section {
    padding: 5rem 0;
    text-align: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
}

.cta-section h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
}

.cta-section p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.cta-section .btn-primary {
    background: var(--white);
    color: var(--primary);
    border-color: var(--white);
}

.cta-section .btn-primary:hover {
    background: var(--gray-100);
    transform: translateY(-2px);
}

/* ===== Contact Section ===== */
.contact-section {
    padding: 4rem 0;
    background: var(--light);
}

.contact-info {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
}

.contact-item {
    padding: 0.75rem 0;
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* ===== Footer ===== */
.footer {
    background: var(--dark);
    color: var(--gray-400);
    padding: 3rem 0 1.5rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-brand p {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--gray-400);
}

.footer-brand .logo {
    color: var(--white);
}

.footer-links h4 {
    color: var(--white);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

.footer-links ul li {
    margin-bottom: 0.4rem;
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--gray-400);
}

.footer-links a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.footer-legal-links {
    display: flex;
    gap: 1.5rem;
}

.footer-legal-links a {
    color: var(--gray-400);
}

.footer-legal-links a:hover {
    color: var(--white);
}

/* ===== Pricing Page ===== */
.pricing-hero {
    padding: 4rem 0 2rem;
    background: linear-gradient(180deg, var(--primary-light) 0%, var(--white) 100%);
}

.pricing-hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
}

.billing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.toggle-label {
    font-size: 0.95rem;
    color: var(--gray-500);
    font-weight: 500;
}

.toggle-label.active {
    color: var(--dark);
    font-weight: 600;
}

.save-badge {
    background: var(--secondary-light);
    color: var(--secondary);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.toggle-switch {
    position: relative;
    width: 48px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--gray-300);
    border-radius: 26px;
    transition: 0.3s;
}

.toggle-slider::before {
    content: "";
    position: absolute;
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: var(--white);
    border-radius: 50%;
    transition: 0.3s;
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--primary);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(22px);
}

/* Pricing Cards */
.pricing-section {
    padding: 2rem 0 5rem;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    align-items: start;
}

.pricing-card {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 2rem;
    position: relative;
    transition: all 0.3s;
}

.pricing-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.pricing-card.popular {
    border-color: var(--primary);
    box-shadow: var(--shadow-xl);
    transform: scale(1.03);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: var(--white);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.pricing-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.pricing-desc {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.pricing-price {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 1.5rem;
}

.price-currency {
    font-size: 1.5rem;
    font-weight: 700;
    vertical-align: top;
}

.price-amount {
    font-size: 3rem;
    font-weight: 800;
    color: var(--dark);
}

.price-period {
    font-size: 0.95rem;
    color: var(--gray-500);
}

.pricing-features {
    margin-bottom: 2rem;
}

.pricing-features li {
    padding: 0.4rem 0;
    font-size: 0.92rem;
    color: var(--gray-700);
}

.pricing-features li.disabled {
    color: var(--gray-400);
}

/* FAQ */
.faq-section {
    padding: 4rem 0;
    background: var(--gray-100);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}

.faq-item h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.faq-item p {
    font-size: 0.9rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== Payment Modal ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    max-width: 480px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-500);
    line-height: 1;
}

.modal-body {
    padding: 1.5rem;
}

.selected-plan {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--primary-light);
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
}

.plan-name {
    font-weight: 600;
    color: var(--primary);
}

.plan-price {
    font-weight: 700;
    color: var(--dark);
}

.payment-maintenance {
    text-align: center;
    padding: 1.5rem;
    background: var(--gray-100);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}

.maintenance-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.payment-maintenance h4 {
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.payment-maintenance p {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.maintenance-zh {
    color: var(--gray-500);
    font-size: 0.85rem;
    font-style: italic;
}

.maintenance-info {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-200);
    text-align: left;
}

.maintenance-info p {
    font-size: 0.85rem;
    margin-bottom: 0.3rem;
}

.maintenance-info a {
    color: var(--primary);
    text-decoration: underline;
}

/* ===== Legal Pages ===== */
.legal-page {
    padding: 4rem 0;
    background: var(--light);
}

.legal-container {
    max-width: 800px;
}

.legal-container h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.legal-updated {
    color: var(--gray-500);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.legal-content h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.legal-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

.legal-content p {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.legal-content ul {
    margin: 0.5rem 0 1rem 1.5rem;
    list-style: disc;
}

.legal-content ul li {
    font-size: 0.93rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 0.3rem;
}

.refund-highlight {
    background: #FEF3C7;
    border: 1px solid #F59E0B;
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 2rem;
}

.refund-highlight h3 {
    color: #92400E;
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.refund-highlight p {
    color: #92400E;
    margin-bottom: 0;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .pricing-card.popular {
        transform: none;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-trust {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }
}